LDD Moth

Lymantria dispar dispar or “LDD moth” (formerly known as gypsy moth) is a forest defoliating insect found in Ontario. Outbreaks occur every 7 to 10 years.

The province of Ontario posts information here and makes available a protocol document (PDF, 5 pages) with steps to conduct an egg mass survey to estimate the population of the moths on your own property.

(For the map at the side, of deforestation in Ontario in 2021, click here and scroll down the page)

News & Related Events:

December 1, 2021 – Ontario Woodlot Association LDD / Gypsy moth webinar – a look back at 2021, and a 2022 outlook

November 14, 2021 – What invasive gypsy moth caterpillars are doing to our lakes and streams (CTVNews)

Oct 27, 2021 – Moth infestation tripled in 2021, with eastern Ontario bearing the brunt – “They’ve been moving eastward toward Ottawa, Carleton Place and Pakenham.” (Ottawa Citizen)

August 31, 2021 – Hastings County asking for help to track LDD infestations (Hastings County)

July 2021 – see additional resources posted by the Environment Council for Clear, Ston(e)y and White Lakes

June 23, 2021 – as reported by the Ontario Woodlot on Twitter: “A member reports that the virus and fungus are taking hold. The photo shows the classic fungus (left) and virus (right) effects.” [see image at the side]

June 2021 – We are pleased to provide access to a recording of an informative June 10, 2021 gypsy moth webinar hosted by the Eastern Ontario Model Forest (EOMF)  and Ontario Woodlot Association (OWA) websites .  On their webpages you will find a link and passcode to the webinar.

May 22, 2021 – Gypsy moth caterpillars ‘virtually everywhere’ in SW Ontario, expert says (CBC.ca)

May 3, 2021 – Town of Oakville to conduct aerial spraying to combat gypsy moths (Toronto Star)

April 2021 – Gypsy Moth Information from the Regional Forest Health Network (Southern Ontario)


July 30, 2020 – FOCA webinar: Understanding the Gypsy Moth – FOCA Members are welcome to click to view the digital recording of the webinar (1 hour, 15 minutes) or download the slides (PDF, 7 MB)

Information about Gypsy Moths:

July 22, 2020 – How Ontario is battling a very hungry caterpillar (TVO) – Gypsy-moth caterpillars are killing trees throughout the province.

July 15, 2020 – Eastern Ontario in grip of worst Gypsy moth outbreak in 30 years (Belleville Intelligencer)

July 9, 2020 – Forests in Peterborough and the Kawarthas are under attack (Peterborough Examiner)

Michelle LewinLDD Moth